HarrieH's classic track bike projectA track bike has the beauty of simplicity. No distraction of cables, bottle holders, pumps and other accessories. Just a frame, fork, drivetrain, steering components and something to sit on will do the job on a track.
Some parts I already have for decades, others I have to collect. It's fun to look for the right components, to get them, build up the bike and, of course, ride it on the velodrome.
Oh, besides track, lots of (off-)road stuff as well.

New decals (stickers) for my Vitus 992 Ovoid frame and fork.
I've scanned them, so in case I need new ones, I can trace the contours and make new artwork in a vector drawing program.
This is where I got the stickers: http://www.wanit.co.uk/contents/en-uk/d20.html
Also present on Ebay (same seller, same price).